Meta-amidotolyloxaminsulfo-acid.



UNITED STATES PATENT OFFICE.

RICHARD TAGGESELL, OF BUFFALO, NEW YORK, ASSIGNOR TO THE SOHOELLKOPF, HARTFORD (it HANNA COMPANY, OF SAME PLACE.

M ETA-AMIDOTOLYLOXAMINSU LFO-ACID.

SPECIFICATION forming part of Letters Patent No. 659,496, dated October 9, 1900.

Application filed April 16, 1900. Serial No. 131109. (Specimens) To all whom, it may concern.-

Be it known that I, RICHARD TAGGESELL, a subject of the King ofSaxony, and a resident of Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Meta -Amidotolyloxaminsulfo-Acid, of which the following is a specification.

Myinvention relates to the production ofa new amido compound which is useful in the COOH c rnsoui COOH .lleta-toluylenegggiinsulfo-d- 3 5 NHOOCOOI'I NH, c rnso ni +H2O' meta-amidotolyloxaminsulfoacid water.

The meta-toluylenediaminsulfoacid used in this process is obtained by heating meta- Ioluylenediamin with anhydrous sulfuric acid and has probably the constitution:

In carrying out my invention in a practical way I proceed as follows: One hundred parts, by weight, of meta-toluyleuediamsulfoacid, two hundred parts of oxalic acid, and six hundred parts of water are subjected to a temperature of from 90 to 100 centigrade for about twenty-four hours. The mixture is then filtered and the crystals of meta-amidosolutions in beautiful crystals.

tolyloxaminsulfoacid produced by this treat- 7 ment remain on the filter. In order to prepare a chemically-pure product, the crude amido compound so produced may be suspended in Water and converted into the calcium salt by means of calcium carbonate. The solution of the calcium salt is then filtered and decomposed by adding muriatic acid. The precipitated meta-amidotolyloxaminsulfoacid is then filtered, pressed, and dried.

This new amido compound is a crystallic powder of a whitish color having a yellowish tinge. It is very little soluble in water and forms with nitrous acid a diazo compound which is precipitated even from very diluted The diazo compound forms, in combination with the socalled salt R,a dyestuff which dyes wool a bright-red or scarlet color. By boiling this new amido compound with a caustic alkali or a strong mineral acid it is decomposed and the original meta -toluylenediaminsulfoacid is formed.

I do not wish to claim anything in this application which is claimed in my application filed April 16, 1900, Serial No. 13,110.

I claim as my invention The herein-described new amido compound, meta-amidotolyloxaminsulfoacid A, of the probable formula,

O H CH NH NHOOCOOH: SO H,

derived from meta-toluylenediaminsuloacid of the probable constitution said amido compound being aslightly-colored, crystalline powder, very little soluble in water, being decomposed by boiling with a caustic alkali or strong mineral acid, thus forming the original meta-toluylenediaminsulfoacid, and forming by treatment with nitrous acid a diazo compound which forms in combination with the so-called salt R a dyestuff which dyes wool a bright red.

Witness my hand this 13th day of April, 1900.

RICHARD TAGGESELL.

Witnesses:

OYESTA HORNBEOK, JNo. J. BONNER. 

